Mott transition and superconductivity in the strongly correlated organic superconductor $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2]$Br

Abstract

The magnetic field effect on the phase diagram of the organic Mott system $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2$]Br in which the bandwidth was tuned by the substitution of deuterated molecules was studied by means of the resistivity measurements performed in magnetic fields. The lower critical point of the first-order Mott transition, which ended on the upper critical field $H_{c2}$-temperature plane of the superconductivity, was determined experimentally in addition to the previously observed upper critical end point. The lower critical end point moved to a lower temperature with the suppression of $T_{\mathrm{c}}$ in magnetic fields and the Mott transition recognized so far as the $S$-shaped curve reached $T=$ 0 when $H>H_{c2}$ in the end.

5 pages, 4 figures

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• Suppression of superconductivity by non-magnetic disorder in organic superconductor $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$
• Thermodynamic Properties of the Mott Insulator-Metal Transition in a Triangular Lattice System Without Magnetic Order
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